diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7d39d41..c732248 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -12,7 +12,7 @@ jobs:
       matrix:
         db: [sqlite3, mysql, postgres]
         ruby_version: ["2.7", "3.0", "3.1", "3.2"]
-        redmine_version: [4.2-stable, 5.0-stable, master]
+        redmine_version: [4.2-stable, 5.0-stable, 5.1-stable, master]
         exclude:
           - ruby_version: "3.0"
             redmine_version: 4.2-stable